对罗氏沼虾初级卵母细胞在卵黄形成期的超微结构变化进行了研究。卵黄形成期早期，初级卵母细胞体积和细胞核迅速增大，核内核糖 体等物质通过核孔复合体活跃地向胞质转移，同时滤泡细胞中的营养物质开始进入初级卵母 细胞。初级卵母细胞内卵黄形成的主要细胞器是线粒体、高尔基体、粗面内质网和核糖体， 其合成过程始于卵黄形成期中期，并一直延续至后期。在卵黄形成期中期，发现滤泡细胞内 的线粒体也有类似的卵黄物质合成功能。同时滤泡细胞继续有物质通过指状通道进入初级卵 母细胞，直接或间接转化为卵黄物质。卵黄形成期后期，初级卵母细胞核膜逐渐消失，随着卵黄粒在初级卵母细胞中大量沉积，滤泡细胞内的营养物质向初级卵母细胞的转移通道变细 ，转移过程也最后停止。%In this paper，the ultrastructural changes of the oocyte of the first order of Macrobrachium rosenbergii are discussed during the vitellogenesis. In its early vitellogenesis，it was observed that the substance of its nucleus was activ ely transferred to the cytoplasm through the nuclear pore or membrance; that the substance of the follicle cell came into the oocyte I through sawtooth-like pr ojections. The primary cell organelles of the formation of yolk granule were th e mitochondria, the golgi complex, the rough endoplasmic reticulum and the ribos ome in the oocyte Ⅰ. This process of formation began in the middle to later vi tellogenesis.In middle vitellogenesis, it was observed that mitochondria of the follicle cell has similar function of the formation of yolk. In later vitellog enesis, the nuclear membrance of oocyte Ⅰ disappeared gradually. The finger-l ike channel between the oocyte Ⅰ and the follicle cell became tiny, along with large accumulation of the yolk granule. The process for the substance of the f ollicle cell to tranform into the oocyte Ⅰ was finally stopped.
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